This 1896 De La Vergne oil engine is the same as that used to power the Marconi transmitters on Cape Cod Massachusetts in 1902. It is similar to a Diesel but depends on the heat of a large combustion chamber to ignite the air/fuel mixture, not high compression. It has fuel injection that sprays oil into the combustion chamber.
The engine was restored by museum volunteers (Mal Long, Warren Hagist, Lou Vertefeuille, Fred Jaggi, Leigh Atwood, Bob Phillips, Tom Patterson and Harold Foster) in 2000.